[Hepatitis C--treatment of untreated (naive) patients].

The most important therapeutic advance in recent years considering chronic HCV infection has occurred with the introduction of pegylated interferon (PEG IFN) in the combination therapy with ribavirin, which results in better sustained virologic response (SVR). Although an SVR is difficult to correlate with improved survival because of the necessity for long-term follow up, the absence of detectable serum HCV RNA has been associated with resolution of liver injury, reduction in hepatic fibrosis, and a low likelihood of a relapse of the HCV infection. Two large pivotal trials examined the efficacy of PEG IFN plus ribavirin in the treatment of chronic HCV infection. Overall, PEG IFN plus ribavirin was more effective than the standard interferon-ribavirin combination. SVR rates were similar with both forms of PEG IFN (PEG IFN alfa-2a and PEG IFN alfa-2b) when used in combination with ribavirin. SVR rates of 42% and 46% were achieved in patients with genotype 1 compared to rates of 76% and 82% in patients with genotypes 2 and 3. Factors associated with successful therapy included genotypes other than 1, lower baseline viral levels, less fibrosis or inflammation on liver biopsy, and lower body weight or body surface area. Twenty four weeks of treatment with a combination of PEG IFN and ribavirin appears to be sufficient for patients infected with genotypes 2 and 3, while patients with genotype 1 need 48 weeks of treatment. Early virologic response (EVR), defined as undetectable HCV RNA or a minimum 2 log decrease in viral load (relative to baseline) after the first 12 weeks of treatment, is predictive of SVR and should be a routine part of monitoring patients with genotype 1. Patients who fail to achieve an EVR have only a small chance of achieving an SVR, therefore treatment should be discontinued after 12 weeks. It is also recommended to treat patients with acute hepatitis C to reduce the risk of developing chronic infection. Treatment should start 12 weeks after the onset of symptoms and includes 24 weeks of monotherapy with PEG IFN.